Avoid getting the same prefix data more than once for VLAN check

[royvegard]

When getting prefix data from IPAM, the same data is transmitted several times. For every ip address that is inside a prefix, the same prefix data is read over and over.

karsto_scripts/python/ipam-check-nozomi-vlan.py

Line 63 in 12d1458

conn.request("GET", f"/api/ipam/prefixes/?{params}", None, headers)